diff --git a/test/test_chunked.py b/test/test_chunked.py
new file mode 100644
index 000000000..caa26f7eb
--- /dev/null
+++ b/test/test_chunked.py
@@ -0,0 +1,188 @@
+import re
+
+import pytest
+from unit.applications.lang.python import ApplicationPython
+
+prerequisites = {'modules': {'python': 'any'}}
+
+client = ApplicationPython()
+
+
+@pytest.fixture(autouse=True)
+def setup_method_fixture():
+    client.load('mirror')
+
+    assert 'success' in client.conf(
+        {"http": {"chunked_transform": True}}, 'settings'
+    )
+
+
+def test_chunked():
+    def chunks(chunks=[]):
+        body = ''
+
+        for c in chunks:
+            body = f'{body}{len(c):x}\r\n{c}\r\n'
+
+        resp = client.get(
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': 'chunked',
+            },
+            body=f'{body}0\r\n\r\n',
+        )
+
+        expect_body = ''.join(chunks)
+
+        assert resp['status'] == 200
+        assert resp['headers']['Content-Length'] == str(len(expect_body))
+        assert resp['body'] == expect_body
+
+    chunks()
+    chunks(['1'])
+    chunks(['0123456789'])
+    chunks(['0123456789' * 128])
+    chunks(['0123456789' * 512])
+    chunks(['0123456789' * 128, '1', '1', '0123456789' * 128, '1'])
+
+
+def test_chunked_pipeline():
+    sock = client.get(
+        no_recv=True,
+        headers={
+            'Host': 'localhost',
+            'Transfer-Encoding': 'chunked',
+        },
+        body='1\r\n$\r\n0\r\n\r\n',
+    )
+
+    resp = client.get(
+        sock=sock,
+        headers={
+            'Host': 'localhost',
+            'Transfer-Encoding': 'chunked',
+            'Connection': 'close',
+        },
+        body='1\r\n%\r\n0\r\n\r\n',
+        raw_resp=True,
+    )
+
+    assert len(re.findall('200 OK', resp)) == 2
+    assert len(re.findall('Content-Length: 1', resp)) == 2
+    assert len(re.findall('$', resp)) == 1
+    assert len(re.findall('%', resp)) == 1
+
+
+def test_chunked_max_body_size():
+    assert 'success' in client.conf(
+        {'max_body_size': 1024, 'chunked_transform': True}, 'settings/http'
+    )
+
+    body = f'{2048:x}\r\n{"x" * 2048}\r\n0\r\n\r\n'
+
+    assert (
+        client.get(
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': 'chunked',
+            },
+            body=body,
+        )['status']
+        == 413
+    )
+
+
+def test_chunked_after_last():
+    resp = client.get(
+        headers={
+            'Host': 'localhost',
+            'Connection': 'close',
+            'Transfer-Encoding': 'chunked',
+        },
+        body='1\r\na\r\n0\r\n\r\n1\r\nb\r\n0\r\n\r\n',
+    )
+
+    assert resp['status'] == 200
+    assert resp['headers']['Content-Length'] == '1'
+    assert resp['body'] == 'a'
+
+
+def test_chunked_transform():
+    assert 'success' in client.conf(
+        {"http": {"chunked_transform": False}}, 'settings'
+    )
+
+    assert (
+        client.get(
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': 'chunked',
+            },
+            body='0\r\n\r\n',
+        )['status']
+        == 411
+    )
+
+
+def test_chunked_invalid():
+    # invalid chunkes
+
+    def check_body(body):
+        assert (
+            client.get(
+                headers={
+                    'Host': 'localhost',
+                    'Connection': 'close',
+                    'Transfer-Encoding': 'chunked',
+                },
+                body=body,
+            )['status']
+            == 400
+        )
+
+    check_body('1\r\nblah\r\n0\r\n\r\n')
+    check_body('1\r\n\r\n1\r\n0\r\n\r\n')
+    check_body('1\r\n1\r\n\r\n0\r\n\r\n')
+
+    # invalid transfer encoding header
+
+    assert (
+        client.get(
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': ['chunked', 'chunked'],
+            },
+            body='0\r\n\r\n',
+        )['status']
+        == 400
+    ), 'two Transfer-Encoding headers'
+
+    assert (
+        client.get(
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': 'chunked',
+                'Content-Length': '5',
+            },
+            body='0\r\n\r\n',
+        )['status']
+        == 400
+    ), 'Transfer-Encoding and Content-Length'
+
+    assert (
+        client.get(
+            http_10=True,
+            headers={
+                'Host': 'localhost',
+                'Connection': 'close',
+                'Transfer-Encoding': 'chunked',
+            },
+            body='0\r\n\r\n',
+        )['status']
+        == 400
+    ), 'Transfer-Encoding HTTP/1.0'
diff --git a/test/unit/http.py b/test/unit/http.py
index 9401501b6..e449c8b54 100644
--- a/test/unit/http.py
+++ b/test/unit/http.py
@@ -67,7 +67,7 @@ def http(self, start_str, **kwargs):
 
                     headers['Content-Type'] = content_type
 
-                if 'Content-Length' not in headers:
+                if 'Content-Length' not in headers and 'Transfer-Encoding' not in headers:
                     headers['Content-Length'] = len(body)
 
             for header, value in headers.items():